its a normal rca input screen. There won't be much of a WOW factor. DVD's will look just fine. GPS will suck unless you use like co-pilot. As for mp3 and the rest, you'd want to use a frontend like media engine or such that is made for non-vga input screens.
'98 Explorer Sport
http://mp3car.zcentric.com (down atm)
AMD 800mhz 192megs RAM 60gig hard drive 9 inch widescreen VGA